noun

1. a government document issued to a citizen for travel abroad, subject to visa requirements, certifying identity and citizenship: it entitles the bearer to the protection of his or her own country and that of the countries visited
2. safe-conduct (senses & )
3. anything that enables a person to be accepted, admitted, etc.

Etymology: Fr passeport, safe-conduct, orig., permission to leave or enter a port < passer, pass + port, port